Originally Posted By CMcAllister
Actually I read a story that said Mopar made the aluminum block a replacement part, accepted by NHRA, because all the iron blocks were only available as a long block assembly.

Much more likely it was as much or more ring seal as anything. If i recall correctly, Chuck said he picked up two tenths plus from that alone.

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky